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Effect of high specific-activity sulfur colloid preparations on sentinel node count rates
Borys R Krynyckyi1, Zhuang-Yu Zhang, Chun K Kim
1Division of Nuclear Medicine, Department of Radiology, The Mount Sinai School of Medicine of New York University, New York, New York, USA. SYROB@MSN.COM
Clinical Nuclear Medicine
|January 12, 2002
Summary
Increasing the specific activity (SA) of Technetium-99m sulfur colloid (SC) preparations significantly enhances sentinel node imaging. Higher SA SC injections resulted in substantially greater measured counts in sentinel nodes compared to lower SA preparations.
Area of Science:
- Nuclear Medicine
- Radiopharmacy
- Surgical Oncology
Background:
- Sentinel lymph node biopsy (SLNB) is crucial for cancer staging.
- Optimizing radiotracer properties can improve SLNB accuracy.
- Previous studies indicated higher specific activity (SA) nanocolloids enhance sentinel node detection.
Purpose of the Study:
- To investigate if higher specific activity (SA) of Technetium-99m sulfur colloid (Tc-99m SC) preparations improves sentinel node imaging compared to lower SA preparations.
- To evaluate the impact of Tc-99m SC SA on measured counts in sentinel nodes.
Main Methods:
- A comparative study involving 23 patients (low SA group) and 28 patients (high SA group).
- Standardized peritumoral and intradermal injections of Tc-99m SC were administered.
- Regions of interest were drawn around sentinel nodes and injection sites to calculate count ratios.
Main Results:
- The high SA group demonstrated a 2.9-fold greater mean ratio of sentinel node to injection site counts compared to the low SA group.
- The median ratio was 2.7 times higher in the high SA group, indicating improved visualization.
Conclusions:
- Higher specific activity (SA) Tc-99m sulfur colloid (SC) preparations can lead to increased counts in sentinel nodes.
- These findings suggest that optimizing Tc-99m SC SA may enhance sentinel node detection in SLNB procedures.